BF-T型浮选机在铁精矿提铁降杂工艺中的应用

BF-T型浮选机是北京矿冶研究总院针对铁精矿反浮选的工艺特点专门研究改进的一种高效浮选设备。近年来,BF-T型浮选机在国内十多个铁矿选矿厂得到了广泛应用,取得了良好的经济效益和社会效益。本文论述了BF-T型浮选机的结构、特点及推广应用情况。     

芬兰奥托昆普公司浮选机的研究与开发

本文叙述了奥托昆普公司从制造小容积OK－3浮选柚以自己研制大容积OK－8、OK－16、OK－38、TankCell-60、TankCell-100、TankCell-160、TankCell-200浮选机的发展史。特别是TankCell筒形浮选机已得到广泛应用。这些浮选机搅拌能力强，充气强度高，单位处理能力设备投资费用低，能耗小，浮选指标高。     

射流浮选机在锌精选作业中的应用

简述了射流浮选机工作原理,重点描述了射流浮选在锌精选中的应用情况。700 t/d的硫精矿提质及回收锌车间采用射流浮选机作为精选设备,粗精矿经立式搅拌磨再磨后给入射流浮选机进行精选,经过3次精选后,锌品位由粗精矿中的12%～18%提高到精矿中的33%～40%。生产实践中锌精矿综合指标为:锌品位为38.68%,锌回收率为70.06%,铅含量为10.92%;提质硫精矿锌+铅的综合含量为1.08%。实践证明射流浮选机适用于细粒矿物浮选,且性能优越。     

贱金属矿石选矿设备的新发展

本文评述了近几年贱金属矿石选矿设备的最重大发展。发展涉及选矿各个领域,例如,浮选机技术、再磨、浓缩、过滤和过程控制。     

梅山选矿磨浮系统1~#系列设备升级改造实践

针对梅山选矿厂磨浮系统存在的问题,提出了对磨浮系统1~#系列的技术改造方案。通过采用滚动轴承代替球磨机滑动轴承,二段分级设备用FX-500型水力旋流器取代2FC-20型螺旋分级机,用KYF-8型浮选机替代现场粗、扫选的BS-K6型浮选机,SF-4型浮选机替代现场精选的SF-1.2型浮选机,显著提高了系统的稳定性,降低了工人的检修强度,主要经济技术指标全面优化,磨矿效率提高约6%,二段分级质效率提高了7.76个百分点,硫资源回收率提高了6.09个百分点,年直接经济效益达97.85万元。     

680m~3浮选机工业试验研究

680m~3浮选机是我国自主研制成功的世界最大规格浮选机,该浮选机在江西某铜矿选矿厂进行了长期工业试验,用于处理铜尾矿,实现了回收率的提升。确定了680m~3浮选机泡沫产品再磨后返回和不磨直接返回原流程两个试验方案。试验结果表明,680m~3浮选机泡沫产品再磨后返回原流程,可使选矿厂综合回收率提升1.48个百分点,而泡沫不磨直接返回原流程无法明显地提高回收率。粒度分析表明,680m~3浮选机给矿中+74μm粒级铜金属分布率占比为57.31%,泡沫产品中该粒级铜金属分布率占比达到76.33%,证实680m~3浮选机更有利于回收尾矿中损失的粗颗粒矿物。工业试验为采用大型浮选机处理低品位矿石提供了技术支撑。     

维姆科大型浮选机的性能和生产实例

在廿世纪六十年代期间,由于低品位矿体的大量开采,磨机及磨矿车间的扩大,要求浮选设备也随之扩大。为了满足这种要求,维姆科公司试制了一种300立方呎的浮选机,其容积为标准型№66浮选机的5倍。№66浮选机选别斑岩铜矿的平均处理量每槽为100吨/日,№120浮选机(300立方呎)每槽将能处理500吨/日,并且选别效果及单位动力消耗均相等。№120浮选机在工业上的应用并且导致了更大型的№144浮选机的试制。     

柱机联合浮选流程在难选硫化镍矿分选中的应用

传统的单一浮选机分选工艺适合处理粒度较粗的矿石,处理贫细难选矿石时存在细粒级回收率低,流程复杂的问题。旋流静态微泡浮选柱作为一种新型的高效分选设备在微细难选矿石处理领域得到了广泛应用。试验利用浮选柱和浮选机各自的分选优势通过柱机联合流程工艺处理低品位难选硫化镍矿,得到了尾矿Ni品位0.18%、回收率81.62%的指标,试验结果表明柱机联合流程有效提高了分选指标,为分选该类矿石提供了一种新的途径。     

浮选机生产中异形机组的研制

浮选机BF型因其具有自身吸气、吸矿、节能和适应性强等特点,是我国广泛应用下选矿厂的重要设备。浮选生产由粗选作业到精选作业,矿物的总量是一逐渐减少的过程,根据生产实际,经常需要不同规格机型浮选机的同时使用。 1 目标及方法 前时期我机械所制造部承接一批BF-1.2及BF-2.0浮选机     

提高浮选机可维修性的实践

随着矿山开采中段的下延,矿石品位负变加剧。为了提高产量,山东黄金矿业股份有限公司新城金矿磨浮系统处理量从1500t/d增加到4000t/d。因此必须合理选择设备的维修方法,缩短浮选机的维修时间,提高浮选设备的有效利用率,以保证生产任务的完成。1存在的问题新城金矿浮选生产线共有48台XCF-4和XCF-8型浮选机,24h连续运转,一旦因故障停车,就会造成全线停车。     

Designing flotation circuits for high fines recovery

Many flotation operations need to improve liberation to increase recovery, yet operators are often concerned that finer grinding will produce “slimes” with low flotation recovery. The development of large scale stirred mills like the IsaMill has now enabled simple circuits with excellent fines recovery. The ability to grind in a small footprint with high energy efficiency and sharp size distribution supports a staged grinding and flotation approach, applying grinding power only where liberation is needed. Most importantly, the inert grinding environment has profound benefits for flotation compared with conventional steel grinding. Flotation rates and recoveries are improved and reagent needs are lowered. This paper describes design principles for fines flotation and challenges common “myths” about fines and flotation cells. It considers several operations where the design principles have been successfully applied, and describes performance on a size-by-size mineralogical basis.It is argued that the substantial benefits of high efficiency, distributed, inert grinding will have much wider implications for circuit design beyond ultrafine grained ores.     

The effect of particle breakage mechanisms during regrinding on the subsequent cleaner flotation

Stirred mills have been widely used for regrinding, and are acknowledged to be more energy efficient than tumbling mills. These two types of mills present different particle breakage mechanisms during grinding. In this study, the effect of regrinding by both mills on surface properties and subsequent mineral flotation was studied, using chalcocite as the mineral example. A rod mill and a stirred mill with the same stainless steel media were used to regrind rougher flotation concentrates. Different chalcocite flotation recovery was achieved in the cleaner stage after regrinding in tumbling and stirred mills. The factors contributing to the different recovery included particle size, the amount of created fresh surfaces, surface oxidation and the redistribution of collector carried from rougher flotation. All the factors were examined. It was determined that the predominating factor was the different distribution of collector resulting from different particle breakage mechanisms in the stirred and tumbling mills, in line with ToF-SIMS analysis. In the tumbling mill, the impact particle breakage mechanism predominates, causing the collector to remain on the surface of newly produced particles. In the stirred mill, the attrition breakage removes collector from the surface, and decreases particle floatability. Furthermore, the type of grinding media in the stirred mill also influences the subsequent flotation, again due to the change of particle breakage mechanisms. The results of this study demonstrate that the selection of regrinding mills and grinding media should not only depend on the required energy efficiency, but also on the properties of the surfaces produced for subsequent flotation.     

The effect of regrind mills on the separation of chalcopyrite from pyrite in cleaner flotation

Stirred mills have been widely used for regrinding and are more energy efficient than tumbling mills. These two types of mills present different particle breakage mechanisms and redox environments during grinding. In this study, the effect of regrinding with these two types of mills on the separation of chalcopyrite from pyrite in the cleaner stage was studied. A laboratory rod mill and a laboratory stirred mill were used to regrind rougher flotation concentrates. It was found that chalcopyrite and pyrite exhibited different flotation behavior after regrinding with the rod mill and the stirred mill, resulting in different separability of chalcopyrite from pyrite. The mechanism underpinning this phenomenon was investigated by a range of techniques including dissolved oxygen demand measurements, X-ray photoelectron spectroscopy (XPS) and Time of flight secondary ion mass spectrometry (ToF-SIMS). It was found that the two mills produced different surface oxidation and pyrite activation by copper ions which determined the separation of chalcopyrite from pyrite. This study demonstrates that the selection of a regrind mill should not only depend on its energy efficiency but also the property of surfaces produced for subsequent flotation.     

两种浮选柱矿物选别工艺特性分析

KYZ-B型浮选柱和旋流—静态微泡浮选柱(FCSMC)都是近年来在选矿实践中应用较多的浮选柱机型。近年来正在向铁矿反浮选、磷化工、钾盐选矿、油污废水处理和废纸脱墨等领域发展。两种机型虽然都属于柱形浮选设备,但两者在柱体结构、气泡发生方式、矿化方式、自动控制技术、溢流堰的泡沫负荷和能耗等方面存在较大不同。文中对比阐述两种类型的浮选柱在以上六个方面各自特点,同时分析了两种类型浮选柱在不同矿物选别工艺上的差别,为两种浮选柱的选型使用提供依据。     

某铅锌矿立磨机与球磨机磨矿效果对比试验研究

立磨机和球磨机都是大型工业磨粉设备,被广泛应用于选矿、冶金、化工和煤炭等行业。本文针对某铅锌矿对比两种磨机的磨矿效果,采用立磨机与球磨机进行磨矿试验,并对试验产品进行筛分分析、单体解离度分析及浮选试验。试验结果表明:立磨机磨矿试验产品中粗粒级含量较球磨机试验产品下降了0.6百分点,方铅矿和闪锌矿单体解离度分别提高2.28和1.60百分点;立磨—浮选试验产品中铅精矿中铅品位及累计回收率较球磨机分别提高0.65和0.61,锌精矿中锌品位及累计回收率较之分别提高0.34和1.03百分点,硫精矿中铅和锌含量分别下降0.02、0.06百分点。综上所述针对该铅锌矿立磨机磨矿效果均优于球磨机。      

提高铜山口铜矿选铜回收率的生产实践

通过对铜山口铜矿选铜回收率偏低原因的分析,针对磨矿分级效果、浮选机性能、石灰和药剂添加系统存在的问题,在查阅资料和选矿试验的基础上,进行了合理的选矿工艺改进措施。     

磨矿介质对黄铁矿表面性质和浮选行为的影响

利用SEM、XPS现代测试技术及浮选试验考察了瓷磨黄铁矿和铁磨黄铁矿的表面性质与浮选行为。结果表明,分别采用瓷介质与铁介质磨矿时,黄铁矿的表面形态、表面氧化产物及浮选行为存在明显差异。采用瓷介质磨矿时,黄铁矿的浮选效果明显好于采用铁介质磨矿的情形,更有利于黄铁矿的浮选回收。铁磨黄铁矿表面粗糙,腐蚀严重,存在大量的非晶质化亲水性的FeOOH是造成其表面亲水性增强、浮选回收率低的主要原因。     

Applying traceability to grinding circuits by using Particle Texture Analysis (PTA)

LKAB has started a new pelletizing plant at Malmberget, where the raw material will be a mix of ores from Kiruna and Malmberget. The new plant necessitated an investment in a new grinding section in the concentrator. As usual, the new section has larger mills. It also lacks the wet cobbing stage present in the old sections.Comparing the analysis data from the new grinding section with the old grinding sections it shows that they give similar results. There are slight variations; the older mills produce a steeper final particle size distribution. Also, it appears that the new mills are more efficient, since they have higher calculated grindability indices.To better understand the differences between the sections, and the process implications of the new grinding section, a combination of Particle Texture Analysis (PTA) and the statistical method multivariate data analysis (MVDA) is used. It shows that it is possible to identify and follow systematic changes in the particle morphology of the mill products. Also, that there are differences in process mineralogical aspect between the old and new grinding sections.     

优化选矿工艺,提高选矿综合效益

篦子沟铜矿通过优化选矿生产工艺 ,采取减少排矿口间隙、调整三段破碎比、提高入磨产品粒度、增加钢球充填率、改变浮选流程等措施来达到 3台球磨机处理原 4台球磨机的生产量。通过改造 ,球磨台效由原来的 3 6t/h提高到 42t/h以上 ,预计年增效益 110 73 5 8万元 ,并能安排 12名下岗工人。     

球磨机使用条件对磨球磨损的影响

磨球是球磨机中的易耗件,其磨损因素很多。从磨球零件的工作情况、受力情况及失效形式的分析出发,分析讨论了球磨机结构参数及使用条件对磨球工作中冲击磨损产生的影响。提出球磨机结构参数选择设计时应注意的问题。